So what is "Composer" to begin with? It's a PHP library that allows developers to easily include other PHP software in a project. With AdaptCMS, we use composer to pull in a framework and third-party libraries for many parts of the website. It auto-loads in these libraries and allows us to easily use those libraries quickly.
How do I install it?
If your web server is running a newer version of Ubuntu, you should be able to install composer like this:
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sudo apt-get install composer
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If that doesn't do the trick, check out this guide: